Vacuum generator



FIG. 1 is a top, front and left-side perspective view of a vacuum generator showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The claim has been shown broken away for ease of illustration to show indeterminate length. 

The ornamental design for a vacuum generator, as shown. 